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Penguine tetra

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why my 2 penguin teras and 2 torpedo barb died in the same day without any sign.? they were in community tank with lots of more fish like angles. koi. silver dollar, glass cat fish, black skirt tetras and glow light tetra.

Because that's such a bad mix of fish that I'm wondering if you're actually serious or if you're trolling here.

Of course it's possible that someone is so ignorant as to put this selection together and put these in something smaller than a 200 gallon. Fish collections like that happen. If that's the case then reading the free ebook on this website is a good place to start. Also you might want to post the contents of the tank and the dimensions so we can advice you what to get rid of (most of the fish probably)